API 1080 G - AA Electric

Frequency
Application Information
API 7580 G
PROBLEM
A flow in a process must be accurately measured throughout a wide
range. The flow rate is used by a PLC to control the process. Two flow
meters are utilized, one very accurate at low flow and one very accurate
at high flow. A means for automatic selection of the appropriate
flow meter is required.
Auto-Ranging Flow Meter
SOLUTION
An API 7580 G Field Selectable Isolated Frequency to DC Transmitter
module is used with each flow meter to convert the frequency output to
a 0-10 VDC signal proportional to flow. An API 1080 DIN DC Input,
Wide Ranging, Field Selectable Single Alarm Trip module monitors the
flow rate and transfers the PLC analog input to the flow meter appropriate
for that range.
or 1080 DIN
The second set of relay contacts of the API 1080 DIN provides a PLC binary input with a closure to indicate which flow meter is selected.
PROBLEM
A process requires a controlled water flow which must also be recorded.
Controlling and Recording Water Flow
SOLUTION
A linear flow meter and a control valve are installed in the water line.
Power for the flow meter is provided by the +18 VDC loop excitation
supply available as standard on an API 7580 G Field Selectable
Isolated Frequency to DC Transmitter module. The API 7580 G converts
the frequency output of the flow meter to a 4-20 mA signal which
is used to control and monitor the flow to the process.
The API 7580 G features 30 selectable input ranges from 0-100 Hz to 0-30 KHz, and 16 selectable output ranges. In addition, the optical isolation
protects against unwanted ground loops and electrical noise.
BSOLUTE ROCESS NSTRUMENTS, Inc.
© Absolute Process Instruments, Inc. 11/04 LoopTracker–Reg TM Absolute Process Instruments, Inc.
Sold by AA Electric 1-800-237-8274 Lakeland, FL • Lawrenceville, GA • Greensboro, NC • East Rutherford, NJ www.A-Aelectric.com